Dunbar's number is a perennial pop psychology headline (You Can Only Have 150 Friends!?!
), but in my experience, most people view it to be a pretty plausible theory for social relationspic.twitter.com/3f4wgkO0xC
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Dunbar has done similar research with other apes, including chimpanzees, gorillas, and orangutans, among others Interestingly, Dunbar's number for chimpanzees is around 50—a group size at which most observed chimpanzee tribes begin to fracturepic.twitter.com/262dHL5n9x
Apes maintain group cohesion through 'social grooming', where they pick bugs and debris out of their companions' fur Across species, more grooming enables stronger relationships and larger group sizes The most social non-human apes spend about 20% of their time groomingpic.twitter.com/KPIIzoRwSa
Humans don't do nearly as much grooming as other apes, and even if we did, we couldn't possibly afford to do it enough to build groups of 150+ individualspic.twitter.com/xenLY6PdbZ
Enter language: "Not only can speech be combined with almost every other activity, but it can also be used to address several different individuals simultaneously." Compared to physical grooming, language is *insanely* scalable and efficient as a vector for social bondingpic.twitter.com/E26CgvApzN
In addition to gossip/storytelling, humans also facilitate group cohesion through several other unique verbal and sub-verbal activities, including writing, singing, dancing, and laughter Altogether, Dunbar estimates that our tools are 2-3x more effective than social groomingpic.twitter.com/1FhptCCZUZ
I think language v. grooming is the thing that distinguishes us most from other apes—and the thing that makes it easiest to understand our primate ancestryhttps://twitter.com/choosy_mom/status/1222251506331553793?s=20 …
While it's impressive to understand how effective we are at creating large social graphs, it's important to remember that human communities are a means to an end: longevity, health, and well-beingpic.twitter.com/6GJSUJIlaz
The volume/quality of your social relationships is predictive of a wide range of physiological and mental health outcomes—isolation is a sickness in the literal sensehttps://twitter.com/choosy_mom/status/1221616773159505920?s=20 …
A lot more to talk about here, but I'll end the thread with this very real graph from Dunbar's 'Anatomy of Friendship' (2017), my favorite academic paper of all time
@scienceshitpostpic.twitter.com/PmZIwbdtlK
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